第二节 根据短文内容，从选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Post-it Notes（便利贴）are small pieces of paper that can stick to things. They are very useful for leaving notes. But how were they invented?
The story started with a scientist named Spencer Silver. In 1968, he was trying to make a very strong glue. However, his experiment did not work as planned. 16. Instead, he made a weak glue that could be taken off easily without leaving marks.
For years, no one knew how to use this special glue. Then another scientist, Art Fry, had a problem. 17. He used small papers to mark the pages, but they often fell out. One day, he remembered Silver's glue. 18. He put the glue on small pieces of paper and tried using them in his book. They stuck well and did not harm the pages.
Later, a company started making these sticky notes. 19. People loved them because they were so convenient. Today, Post-it Notes come in many colors and sizes. 20. They are used in homes, schools, and offices all around the world.

16. G 17. A 18. B 19. D 20. F

【分析】
本题为英语七选五题型，需结合短文上下文的语境、逻辑关系（如因果、顺承等），分析每个空白处前后的内容，匹配选项中符合语境的句子。解题时先通读全文把握主旨（便利贴的发明故事），再逐个分析每个空的前后信息，找到逻辑衔接最紧密的选项。
【解析】
16. 前文提到Spencer Silver想制作强力胶水但实验未按计划进行，后文说明他做出了易取下的弱胶水，说明胶水未达到预期效果，对应选项G（The glue did not work as he wanted.）。
17. 后文提到Art Fry用小纸条标记书页但常掉落，结合选项A的内容（He sang in a church group and used a songbook.），可知他的问题是在教堂唱诗班使用歌本时标记纸条易脱落，对应选项A。
18. 前文说Art Fry想到了Silver的特殊胶水，后文说明他用胶水制作的小纸条成功标记书页，说明他认为该胶水能解决自己的问题，对应选项B（He thought it could solve his problem.）。
19. 前文提到公司开始生产便利贴，后文说明人们喜爱这种产品，对应选项D（They were first sold in 1980.），说明产品的首次销售时间，符合语境。
20. 后文说便利贴在全球的家庭、学校、办公室广泛使用，对应选项F（And they are popular everywhere.），说明它们在各处受欢迎，衔接后文的使用范围。
【答案】
16.G 17.A 18.B 19.D 20.F
【知识点】
英语阅读理解 七选五题型 语篇逻辑推理
【点评】
本题围绕便利贴的发明故事设置七选五题目，侧重考查学生对语篇上下文逻辑关系的理解与运用，需结合人物经历和语境匹配选项，难度适中，是常见的英语阅读理解题型。
【难度系数】
0.5